After _____ homework, he goes to bed. [ ]
A. doing
B. do
C. does
D. to do
答案:A
SVK16-3S氮压机轴承温度高报警值为()℃,联锁停机值为()℃.
包扎牢固,应用较广泛的包扎法是()
A.“8”字形
B.回反形
C.螺旋反折形
D.蛇形
E.环形